Volume s1-25, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Summary and Conclusions

Experiments to determine possible mosquito vectors of in the continental United States were inaugurated in Puerto Rico and later transferred to the continental United States.

Mosquito larvae collected in the field were raised to adults. The latter were permitted to feed upon volunteers infected with the periodic strain of . The mosquitoes were dissected at various intervals after feeding and the development of the microfilariae was followed. A total of 1,801 dissections was made of mosquitoes from 15 species.

All of 17 dissected 9½ days or more after feeding showed larvae which had developed to the infective stage.

Sixty per cent of the collected in the continental United States contained infective larvae and an additional 20 per cent had well advanced larvae 9½ days after feeding. A potential infectibility rate of 80 per cent was obtained with this species.

carried infective stage larvae in 35 per cent and well advanced larvae in 32 per cent of the specimens examined, giving an infectibility rate of 67 per cent.

Complete development of the larvae was observed occasionally in certain species which had the following infectibility rates: (collected in Puerto Rico) 12 per cent; , 7 per cent; , 5 per cent; , 3 per cent.

No development beyond the first larval stage was observed in , and .

Inconclusive evidence has been obtained for and . Data secured thus far indicate that none of these species is a good host, with the possible exception of which permitted development to the infective stage in one specimen with well advanced stages in five other specimens.

Development to the infective stage was attained in most mosquitoes within two weeks and followed a pattern previously described by other investigators. Head or proboscis infections developed in over half of the specimens showing infective larvae.

It is concluded that , and are capable of serving as excellent vectors of should the proper conditions prevail for the spread of filariasis. , and might serve as vectors although their low infectibility rates preclude their playing an important role in the spread of the disease. , and are apparently incapable of transmitting the infection.


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  • Received : 11 Apr 1945
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